Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9300e4c81b87c5…

MALICIOUS

PDF

71.1 KB Created: 2021-04-02 03:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7df3b5b403e53b67084ff39d87525b89 SHA-1: 16d79521d877cd780475dfe79efb10c970852180 SHA-256: 7a9300e4c81b87c55ff8f4959ae78798e549635a9563767e565235de1fc74ef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=entry+level+data+analytics+jobs+chicago PDF link annotation
    • http://skidki-day.store/dofinukw6sny.pdfIn PDF document text
    • http://goodshopsales.xyz/67521384037185dx.pdfIn PDF document text
    • http://instapriz.site/what_chilean_island_inspired_the_story_of_robinson_crusoegof6a.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/vifuparufiko-molefapopunimus-xokuvufixov-zawase.pdfIn PDF document text
    • https://febufovita.weebly.com/uploads/1/3/4/3/134324671/sezukup_senunapazixafu.pdfIn PDF document text
    • http://alcexpress3.xyz/nursing_theoryrnos0.pdfIn PDF document text
    • http://tomandbxof.site/american_history_x_movie_summary6nvvn.pdfIn PDF document text
    • http://loveantravel.xyz/2244394460747tn5.pdfIn PDF document text
    • http://samyog.ru/dexosavetinukesuxabunuknj3ey.pdfIn PDF document text
    • http://slampochka.ru/mokatojetapuxepoxilis1c497.pdfIn PDF document text
    • http://wowitaly.space/47781251801sn2b1.pdfIn PDF document text
    • http://sakhavto.ru/how_to_calibrate_infrared_thermometer_model_qy-ewq-01fto8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/burewova.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/how_to_make_a_roblox_game_vr_compatible.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/bhumihar_attitude_image.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/fadurilototomog.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/anthropogeography_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/xazawedokifeza.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/how_to_contact_the_dmv_in_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/where_to_watch_history_of_the_world_part_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/nudetejoli.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/41078148282.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 5536 bytes
SHA-256: 2f62dd5398ddedefe7bbddc97a35568daa02d093ea76a09efb12359017c978bd
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10100 bytes
SHA-256: 1be18cc8604988d2618c11ca25711de2498b68f8716e54b767cdd208fc0c0045

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